I noticed a few topics on here about rust. I have an old metal lathe that I have been working on that was left outside in the weather for years before I got it. It was extremely rusty. I used Evapo-rust on many of the parts and found it to be awesome on the cast iron parts. After I am finished soaking the parts, I rinse it off with warm water and use a plastic bristle brush to remove the film left on the parts. The Evapo-rust can be reused a many times before it needs to be replaced. The more you use the Evapo-rust the darker it gets because of the iron in the rust. The makers of this product claim that it is safe on hands and is environmentally friendly. I have not used it on cookware yet but the guy in these videos does. Here is the link to a couple of videos showing it being used. When you watch the first video, pause it and read what it says on the bucket. Here are the links enjoy: https://www.youtube.com/watch?v=Bz0_mcWzz-U

Its hard to describe. It doesn't have a citrus smell, It smells more like a detergent it also don't have any strong fumes. After you reuse it a few times it smells like iron which is caused by the rust.

I just used Corroseal "Rust Converter" on my 1976 Scotty frame. It was awesome to see it work. After much grinding and scraping of loose rust and paint, you paint it on as a thin white liquid, which slowly changes to purple and finally black. Probably not the best to use on cookware, but for everything else it seems to do the trick. It smells almost like vinegar. The conversion is very noticeable within 10-15 minutes. I went over everything with a second coat as it was doing its thing. Leaves a nice black surface which they say is a primer that is ready for paint. I bought a gallon from Amazon for $53, and I only used maybe a quart. Pretty cool stuff, with no chemical odor to worry about.